Similar Words to Bitterweed:

Ambrosia
Bristly Oxtongue
Bugloss
Oxtongue
Picris Echioides
Ragweed

Definitions of Bitterweed:

1. Widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
2. Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma